10.2.5
Application Note
(1) Conditions for use of SCI1 in subactive mode and subsleep mode
In subactive or subsleep mode, SCI1 can be used only when the CPU operation clock is ø
(2) Confirming the end of serial transfer
Do not read or write to SCSR1 during serial transfer.
The following two methods can be used to confirm the end of serial transfer:
(a) Using SCI1 interrupt exception handling
Set the IENS1 bit to 1 in IENR1 and execute interrupt exception handling.
(b) Performing IRR1 polling
With SCI1 interrupts disabled (IENS1 = 0 in IENR1), confirm that the IRRS1 bit in IRR1
has been set to 1.
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